My site is slow with Nextgen Gallery

I have seen that my page have been very slow lately. Today I started to search for the reason. I deactivated all plugins, tested my page on http://tools.pingdom.com/. I found out that when I activated NextGen Gallery, that plugin is making my page slow.

Does anyone have any tip on how I can speed up the site or if I can do anything to make my site faster?

I am also goin back to 1.9.13 now there are so many mistakes in the update from 2.0 and up to now, so i am real loosing my patent here
this som are real fun som i see it. are you dudes at Nextgen are inplanting new things in the updates from 2.0 and up to the last one 2-0-40 insted of making the fauls some are in the pre version first, at that way you dudes will newer find the errors some are in the the versions becurse there will come more and more errors ” so make the errors first before cont the work now ,,,, or go back to 1.9.13 to and start from there again,,, becurse som it are now you mates will loose a lot of people som find the plugin great